Before you jet off this summer, it is worth assessing the items that you are most likely to use on your travels and break the annual pattern of overpacking. Despite the fact that all of us travel more than ever, the conundrum of what to pack persists. To offer some guidance, we asked a host of frequent flyers, from directors and designers to personal trainers and presenters, for their trip essentials. Click through the gallery, above, for some sartorial guidance.